JP3380626B2 - Information reproducing method and apparatus - Google Patents

Information reproducing method and apparatus

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Publication number
JP3380626B2
JP3380626B2 JP24987494A JP24987494A JP3380626B2 JP 3380626 B2 JP3380626 B2 JP 3380626B2 JP 24987494 A JP24987494 A JP 24987494A JP 24987494 A JP24987494 A JP 24987494A JP 3380626 B2 JP3380626 B2 JP 3380626B2
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JP
Japan
Prior art keywords
information
recording medium
reproducing
transfer rate
buffer memory
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP24987494A
Other languages
Japanese (ja)
Other versions
JPH08115566A (en
Inventor
隆一 内藤
佳史 塚田
弘行 平野
冠也 松本
裕士 横田
真一 猶原
克美 石井
Original Assignee
パイオニア株式会社
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Publication date
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Priority to JP24987494A priority Critical patent/JP3380626B2/en
Publication of JPH08115566A publication Critical patent/JPH08115566A/en
Application granted granted Critical
Publication of JP3380626B2 publication Critical patent/JP3380626B2/en
Anticipated expiration legal-status Critical
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Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/005Reproducing at a different information rate from the information rate of recording
    • G11B27/007Reproducing at a different information rate from the information rate of recording reproducing continuously a part of the information, i.e. repeating
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/12Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B20/1258Formatting, e.g. arrangement of data block or words on the record carriers on discs where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005Reproducing

Description

Detailed Description of the Invention

[0001]

The present invention relates to a so-called CLV (Constant Linear Velocit) in which information is recorded at a constant linear velocity.
y) A method and apparatus for reproducing information on a disc.

[0002]

2. Description of the Related Art Recently, a so-called CD (Co
A CD-ROM that uses an mpact disk as a ROM (Read Only Memory) used in a computer or the like is becoming popular, paying attention to its large storage capacity. This CD-ROM is a CD
In addition to music signals, data and programs for computers are recorded, and can be supplied at low cost by mass production. Therefore, it has attracted attention as a representative recording medium of recent multimedia.

As described above, the CD-ROM has recording information as
Data for computers and compressed digital video signals are recorded instead of music information. From the viewpoint of improving the recording density, the basic recording format is
It is recorded by the CLV system like a music CD.

This CD-ROM is an external ROM for a computer
In this case, it is required to shorten the time (access time) required to move the optical pickup to a position on the disc where desired data is recorded.
In the case of an LV disc, in order to keep the linear velocity during disc rotation constant, it is necessary to change the rotational angular velocity according to the radial position of the disc, which has been a major obstacle to shortening the access time.

Therefore, the CLV disk is subjected to C
Various techniques for reproducing AV (Constant Angular Velocity) have been proposed.

[0006]

[Problems to be Solved by the Invention] However, CLV
The data on the disk is recorded on the assumption that it will be reproduced under the condition that the linear velocity is constant at the time of reproduction.
When CAV reproduction is performed on the LV disc, the data transfer rate on the inner and outer peripheries of the disc greatly changes.

More specifically, the number of rotations of the disk is about 1
000r.pm, the transfer rate is about 350 at the innermost circumference.
It becomes kBytes / sec, which is about 875 kBytes / sec at the outermost circumference, resulting in a difference of about 2.5 times between the innermost circumference and the outermost circumference of one disc.

In this case, the signal processing unit in the player for processing the data read from the CLV disc is capable of processing the data read at the fastest transfer rate (about 875 kBytes / sec in the above case). have.

However, when data is read from a portion other than the outermost periphery of the disc, the data is read only at a transfer rate lower than the processing capacity, so that there is a problem that efficient signal processing cannot be performed.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to make a CLV disc a CAV.
The purpose is to improve the transfer rate (speed of reading information from the CLV disc) when reproducing.

[0011]

In order to solve the above-mentioned problems, the invention according to claim 1 uses the information recorded on a disc-shaped recording medium such as a CD in which information is recorded at a constant linear velocity.
In an information reproducing method of reproducing through a buffer memory such as AM (Random Access Memory) and outputting to an external device such as a host computer at a predetermined output rate, the information reproduced from the disc-shaped recording medium is read into the buffer memory. Upper limit value and lower limit value of the transfer rate preset so that the transfer rate at the time becomes equal to or higher than the predetermined output rate, the radius of the innermost circumference of the range in which the information on the recording medium is recorded, and the buffer. A setting step of setting a radius range on the recording medium corresponding to a plurality of ring-shaped virtual zones to reproduce the information and a rotation speed of the recording medium for each of the virtual zones, based on a storage capacity of the memory; An information reproducing step of reproducing the information while maintaining the rotation speed corresponding to the virtual zone in the virtual zone. Be done.

According to a second aspect of the present invention, the information on a disk-shaped recording medium such as a CD on which information is recorded at a constant linear velocity is reproduced via a buffer memory such as a RAM, and a host computer is output at a predetermined output rate. In the information reproducing method for outputting the information reproduced from the disk-shaped recording medium to the buffer memory, the transfer rate of the transfer rate set in advance so that the transfer rate when reading the information into the buffer memory is equal to or higher than the predetermined output rate. Based on the upper limit value and the lower limit value, the radius of the innermost periphery of the range in which the information is recorded on the recording medium, and the storage capacity of the buffer memory, the ring-shaped virtual zones to reproduce the information. A setting step of setting the corresponding radius range on the recording medium and the number of rotations of the recording medium for each of the virtual zones; and the information on the recording medium. A detection step of detecting a read position, a determination step of determining the virtual zone including the read position based on the detected read position of the information, and the determined virtual zone corresponds to the virtual zone. An information reproducing step of reproducing the information while maintaining the rotation speed.

According to a third aspect of the present invention, when the information reproduced from a disk-shaped recording medium such as a CD on which information is recorded at a constant linear velocity is read into a buffer memory such as a RAM, a transfer rate is a predetermined output rate. The upper limit value and the lower limit value of the transfer rate preset as described above, the radius of the innermost circumference of the range in which the information on the recording medium is recorded, and the storage capacity of the buffer memory A plurality of ring-shaped virtual zones to be reproduced are set in advance, the radius range on the recording medium corresponding to the virtual zones and the number of rotations of the recording medium for each virtual zone are stored in a memory in advance, and An information reproducing method of reproducing the information of the disk-shaped recording medium through the buffer memory based on the content and outputting the information to an external device at the predetermined output rate. I, a reading step for reading the radial extent and the rotational speed from the memory, a detection step of detecting a read position of said information on said recording medium,
Based on the detected read position of the information, a determination step of determining the virtual zone including the read position, and reproducing the information while maintaining the rotational speed corresponding to the virtual zone in the determined virtual zone And an information reproducing step to be performed.

According to a fourth aspect of the present invention, the information on a disk-shaped recording medium such as a CD on which information is recorded at a constant linear velocity is reproduced via a buffer memory such as a RAM, and a host computer is output at a predetermined output rate. In the information reproducing method for outputting the information reproduced from the disk-shaped recording medium to the buffer memory, the transfer rate of the transfer rate set in advance so that the transfer rate when reading the information into the buffer memory is equal to or higher than the predetermined output rate. A rotation speed setting step of setting a rotation speed of the recording medium based on a lower limit value and a radial position of the recording medium corresponding to a reproduction start position on the recording medium, and a rotation speed set in the rotation speed setting step. An information reproducing step of reproducing the information while maintaining the above, and a detecting step of detecting the amount of information accumulated in the buffer memory,
A determination step of determining whether or not the transfer rate exceeds an upper limit value of a transfer rate set in advance when the information is read into the buffer memory, and the information amount becomes a predetermined amount or more, or When the transfer rate exceeds the upper limit value, all the information stored in the buffer memory is read out, and the amount of information exceeds a predetermined amount, or when the transfer rate exceeds the upper limit value. And a reset step of setting the read position of the information on the recording medium as the reproduction start position.

According to a fifth aspect of the present invention, the information in a disk-shaped recording medium such as a CD on which information is recorded at a constant linear velocity is reproduced via a buffer memory such as a RAM, and a host computer is output at a predetermined output rate. In an information reproducing apparatus for outputting to an external device such as a recording medium, the transfer rate at the time of reading the information reproduced from the disc-shaped recording medium into the buffer memory is equal to or higher than the predetermined output rate. Based on the upper limit value and the lower limit value, the radius of the innermost periphery of the range in which the information is recorded on the recording medium, and the storage capacity of the buffer memory, the ring-shaped virtual zones to reproduce the information. Setting means for setting the corresponding radius range on the recording medium and the number of rotations of the recording medium for each virtual zone, and the virtual zone is set to the temporary And information reproducing means for reproducing the information while keeping the speed corresponding to the zone, configured with a.

According to a sixth aspect of the present invention, the information on a disk-shaped recording medium such as a CD on which information is recorded at a constant linear velocity is reproduced via a buffer memory such as a RAM, and a host computer is output at a predetermined output rate. In an information reproducing apparatus for outputting to an external device such as a recording medium, the transfer rate at the time of reading the information reproduced from the disc-shaped recording medium into the buffer memory is equal to or higher than the predetermined output rate. Based on the upper limit value and the lower limit value, the radius of the innermost periphery of the range in which the information is recorded on the recording medium, and the storage capacity of the buffer memory, the ring-shaped virtual zones to reproduce the information. Setting means for setting the corresponding radial range on the recording medium and the number of rotations of the recording medium for each virtual zone; and the information on the recording medium. A detection unit that detects a read position, a determination unit that determines the virtual zone in which the read position is included based on the detected read position of the information, and the determined virtual zone corresponds to the virtual zone. And information reproducing means for reproducing the information while maintaining the rotation speed.

According to a seventh aspect of the present invention, when the information reproduced from a disk-shaped recording medium such as a CD on which information is recorded at a constant linear velocity is read into a buffer memory such as a RAM, a transfer rate is a predetermined output rate. The upper limit value and the lower limit value of the transfer rate preset as described above, the radius of the innermost circumference of the range in which the information on the recording medium is recorded, and the storage capacity of the buffer memory A plurality of ring-shaped virtual zones to be reproduced are set in advance, and a radius range on the recording medium corresponding to the virtual zone and a rotation number of the recording medium for each virtual zone are stored in advance in the memory. Based on the contents of memory
An information reproducing apparatus which reproduces the information through the buffer memory and outputs the information to an external device at the predetermined output rate, the reading means reading the radius range and the rotation speed from the memory, and the recording medium. Detecting means for detecting a read position of the information, a judging means for judging the virtual zone including the read position based on the detected read position of the information, and a virtual zone in the judged virtual zone. And information reproducing means for reproducing the information while maintaining the rotation speed corresponding to.

According to an eighth aspect of the present invention, the information on a disk-shaped recording medium such as a CD on which information is recorded at a constant linear velocity is reproduced through a buffer memory such as a RAM, and a host computer is output at a predetermined output rate. In an information reproducing apparatus for outputting to an external device such as a recording medium, the transfer rate at the time of reading the information reproduced from the disc-shaped recording medium into the buffer memory is equal to or higher than the predetermined output rate. A rotation speed setting means for setting a rotation speed of the recording medium based on a lower limit value and a radial position of the recording medium corresponding to a reproduction start position on the recording medium, and a rotation speed set in the rotation speed setting step. Information reproducing means for reproducing the information while maintaining the above, and detecting means for detecting the amount of information accumulated in the buffer memory,
Determination means for determining whether or not the transfer rate exceeds a preset upper limit value of the transfer rate at the time of reading the information into the buffer memory, and the information amount becomes a predetermined amount or more, or When the transfer rate exceeds the upper limit value, all the information stored in the buffer memory is read out, and the amount of information exceeds a predetermined amount, or when the transfer rate exceeds the upper limit value. Resetting means for setting the read-out position of the information on the recording medium as the reproduction start position.

[0019]

According to the first aspect of the invention, in the setting step, the upper limit value and the lower limit value of the transfer rate set in advance, the radius of the innermost circumference of the range where the information on the recording medium is recorded, and the buffer memory are set. Based on the storage capacity of the recording medium, the radius range on the recording medium corresponding to the plurality of ring-shaped virtual zones for which information is to be reproduced and the rotation number of the recording medium for each virtual zone are set.

In the information reproducing step, information is reproduced in one virtual zone while maintaining the number of rotations corresponding to the virtual zone. As a result, when reproducing the information recorded on the recording medium corresponding to the range of the set one virtual zone, the recording corresponding to the lower limit value of the transfer rate and the innermost circumference of the one virtual zone. Since the recording medium is driven and the information is reproduced at a constant rotation speed based on the radius on the medium, the transfer rate is always higher than a predetermined output rate.

Therefore, the average transfer rate is improved over the entire recording medium. According to the invention described in claim 2, in the setting step, the upper limit value and the lower limit value of the transfer rate set in advance, the radius of the innermost circumference of the range in which the information on the recording medium is recorded, and the storage capacity of the buffer memory Based on the above, the radius range on the recording medium corresponding to the plurality of ring-shaped virtual zones for which information is to be reproduced and the rotation number of the recording medium for each virtual zone are set.

In the detecting step, the read position of the information on the recording medium is detected. In the determining step, the virtual zone including the read position is determined based on the detected read position of the information.

In the information reproducing step, the information is reproduced while maintaining the rotation speed corresponding to the determined virtual zone.
As a result, when reproducing the information recorded on the recording medium corresponding to the range of the set one virtual zone, the recording corresponding to the lower limit value of the transfer rate and the innermost circumference of the one virtual zone. Since the recording medium is rotated at a constant rotation speed based on the radius on the medium and information is reproduced, the transfer rate is always higher than a predetermined output rate.

Therefore, the average transfer rate is improved over the entire recording medium. According to the third aspect of the invention, in the reading step, the radius range and the rotation speed are read from the memory.

In the detecting step, the read position of the information on the recording medium is detected. In the determining step, the virtual zone including the read position is determined based on the detected read position of the information.

In the information reproducing step, the information is reproduced while maintaining the rotation speed corresponding to the determined virtual zone.
As a result, when reproducing the information recorded on the recording medium corresponding to the range of the set one virtual zone, the recording corresponding to the lower limit value of the transfer rate and the innermost circumference of the one virtual zone. Since the recording medium is rotated at a constant rotation speed based on the radius on the medium and information is reproduced, the transfer rate is always higher than a predetermined output rate.

Therefore, the average transfer rate is improved over the entire recording medium. According to the invention described in claim 4, in the rotation speed setting step, the rotation speed of the recording medium is determined based on the preset lower limit value of the transfer rate and the radial position of the recording medium corresponding to the reproduction start position on the recording medium. To set.

In the information reproducing process, the information is reproduced while keeping the rotation speed set in the rotation speed setting process.
In the detecting step, the amount of information accumulated in the buffer memory is detected.

In the determining step, it is determined whether the transfer rate exceeds the preset upper limit value of the transfer rate when reading the information into the buffer memory. As a result, in the resetting step, the recording medium is rotated by the number of rotations of the recording medium set based on the lower limit value of the transfer rate and the radial position of the recording medium corresponding to the reproduction start position, the information is reproduced, and the buffer is reproduced. When the amount of information stored in the memory exceeds a predetermined amount, or when the transfer rate exceeds its upper limit, all the information stored in the buffer memory is read, and the read position of the information at that time is Reset the playback start position.

Therefore, the transfer rate can be set to a value that is equal to or higher than the lower limit value and equal to or higher than the predetermined output rate and equal to or lower than the upper limit value, and the average transfer rate is improved over the entire recording medium. According to the fifth aspect of the invention, the setting means is configured such that the preset upper and lower limit values of the transfer rate, the radius of the innermost circumference of the range in which the information on the recording medium is recorded, and the storage capacity of the buffer memory. Based on the above, the radius range on the recording medium corresponding to the plurality of ring-shaped virtual zones for which information is to be reproduced and the rotation speed of the recording medium for each virtual zone are set and output to the information reproducing means.

The information reproducing means reproduces information in one virtual zone while maintaining the number of rotations corresponding to the virtual zone. Therefore, when reproducing the information recorded on the recording medium corresponding to the range of the set one virtual zone, on the recording medium corresponding to the lower limit value of the transfer rate and the innermost circumference of the one virtual zone. Since the recording medium is driven and the information is reproduced at a constant rotation speed based on the radius of, the transfer rate is always higher than or equal to the predetermined output rate.

Therefore, the average transfer rate is improved over the entire recording medium. According to the sixth aspect of the present invention, the setting means is configured such that the upper limit value and the lower limit value of the transfer rate set in advance, the radius of the innermost circumference of the range where the information on the recording medium is recorded, and the storage capacity of the buffer memory. Based on the above, the radius range on the recording medium corresponding to the plurality of ring-shaped virtual zones to be reproduced and the rotation number of the recording medium for each virtual zone are set and output to the information reproducing means.

The detecting means detects the read position of the information on the recording medium and outputs it to the discriminating means. The determination means is
Based on the read position of the detected information, the virtual zone including the read position is discriminated and output to the information reproducing means.

The information reproducing means reproduces information while maintaining the number of revolutions corresponding to the determined virtual zone. Therefore, when reproducing the information recorded on the recording medium corresponding to the range of the set one virtual zone, on the recording medium corresponding to the lower limit value of the transfer rate and the innermost circumference of the one virtual zone. Since the recording medium is rotated at a constant rotation speed based on the radius of and the information is reproduced, the transfer rate is always higher than or equal to the predetermined output rate.

Therefore, the average transfer rate is improved over the entire recording medium. According to the invention described in claim 7, the memory stores the radial range on the recording medium corresponding to the plurality of virtual zones and the rotation number of the recording medium for each virtual zone.

The reading means reads the radius range and the rotation speed from the memory and outputs them to the information reproducing means. The detection means detects the read position of the information on the recording medium and outputs it to the determination means.

The discriminating means discriminates the virtual zone including the read position based on the detected read position of the information and outputs it to the information reproducing means. The information reproducing means reproduces information in the determined virtual zone while maintaining the number of rotations corresponding to the virtual zone.

Therefore, when reproducing the information recorded on the recording medium corresponding to the set range of one virtual zone, it corresponds to the lower limit value of the transfer rate and the innermost circumference of the one virtual zone. Since the recording medium is rotated at a constant number of rotations based on the radius on the recording medium and the information is reproduced,
The transfer rate is always higher than a predetermined output rate.

Therefore, the average transfer rate is improved over the entire recording medium. According to the eighth aspect of the present invention, the rotation speed setting means determines the rotation speed of the recording medium based on the preset lower limit value of the transfer rate and the radial position of the recording medium corresponding to the reproduction start position on the recording medium. Is set and output to the information reproducing means.

The information reproducing means reproduces information while maintaining the rotation speed set in the rotation speed setting step. The detection means detects the amount of information accumulated in the buffer memory,
Output to the resetting means.

The determining means determines whether or not the transfer rate exceeds the preset upper limit value of the transfer rate at the time of reading the information into the buffer memory, and outputs a determination signal to the resetting means.

Then, the resetting means rotates the recording medium at the rotational speed of the recording medium set based on the lower limit value of the transfer rate and the radial position of the recording medium corresponding to the reproduction start position, and reproduces the information. When the amount of information stored in the buffer memory exceeds a predetermined amount or when the transfer rate exceeds the upper limit value, all the information stored in the buffer memory is read and the read position of the information at that time is Reset as the playback start position of.

Therefore, the transfer rate can always be set to a value equal to or higher than the predetermined output rate, and the average transfer rate is improved over the entire recording medium.

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, referring to FIG.
It will be described with reference to FIGS. (I) Device Configuration First, the configuration of the CD-ROM player according to the embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, the CD-ROM player S according to the embodiment of the present invention is a CD-ROM on which information is recorded.
Read information from CLV disk 1 as ROM,
A pickup unit 2 for converting into an electric signal and a CD-ROM player S for processing the electric signal based on the detected information
Other than the above, the signal processing unit 8 outputs the signal to a host computer (not shown) and outputs a servo signal for performing servo control of the pickup unit 2 in order to appropriately detect information, and is included in the servo signal from the signal processing unit 8. A spindle motor 6 for rotating the CLV disk 1 based on a rotation speed control signal and a carriage motor 7 for driving a carriage (not shown) for carrying the pickup unit 2.

The pickup unit 2 irradiates the CLV disk 1 with detection light and receives the reflected light, converts the electric light into an electric signal, and outputs the electric signal. The output from the optical pickup 3 is temporarily stored and predetermined. The buffer 4 which outputs at a timing of 1 and an optical pickup position sensor 5 as a detection unit which detects the position of the optical pickup 3 and outputs a position detection signal.

In the signal processing section 8, the RF amplifier 9 is
The RF output signal from the buffer 4 is amplified. Under the control of the controller 13, the servo signal processor 10 is based on the RF signal from the RF amplifier 9 and the position detection signal from the optical pickup position sensor 5 to focus servo, tracking servo, carriage servo and spindle in the optical pickup 3. Outputs servo signal for servo. Digital signal processing unit 12
Under the control of the controller 13, the RF signal input via the servo signal processor 10 is subjected to error correction, deinterleaving, etc., and is output to the buffer RAM 11 serving as a buffer memory. The information stored in the RAM 11 is read out and output to the interface unit 14. Under the control of the controller 13, the interface unit 14 performs an interface operation on the information output from the digital signal processing unit 12 and outputs the information to a host computer (not shown). The controller 13 controls the entire CD-ROM player S based on a predetermined program stored in the ROM 15.

In the above configuration, the information reproduced from the CLV disc 1 by the reproducing method of the present invention is temporarily stored in the buffer RAM 11 and is stored in the interface unit 14 at the output rate set based on the processing capacity of the host computer. Read through.

The setting means, the determining means, the reading means, the determining means and the resetting means in the present invention are included in the controller 13. (II) First Embodiment Next, a first embodiment corresponding to the invention described in claims 1, 2, 5 and 6 will be described with reference to FIGS. 2 to 4.

The operation of the first embodiment shown in FIG. 2 is executed mainly by the controller 15. In FIG. 2, first, the recording capacity usable as the buffer of the buffer RAM 11 is confirmed (step S
1). Next, TOC (Table Of Con
By reading the tents) information, the total amount of information stored in the CLV disk 1 is read (step S2).

Then, the total amount of information, the upper limit value and the lower limit value of the transfer rate at the time of reading information into the preset buffer RAM 11, the usable recording capacity of the buffer RAM 11 and the program area on the CLV disk 1 (information Corresponding to a plurality of ring-shaped virtual zones centered on the center of the CLV disk 1 which is virtually set on the CLV disk 1 based on the radius of the innermost circumference of the area where The radius range on the CLV disk 1, the rotation speed of the CLV disk 1 in each virtual zone, and the number of virtual zones are set (step S
3).

The specific operation in step S3 will be described later in detail. In the embodiment shown in FIG. 2, it is assumed that three virtual zones, zone 1 to zone 3, are set.

If the virtual zone is set in step S3, it is next determined whether or not reproduction is started (step S4). If reproduction is started (step S4; YES),
A reproducing operation is performed (step S5).

In the reproducing operation, CL is performed by the constant number of rotations for each virtual zone set in step S3.
The V disk 1 is driven, information is read into the buffer RAM 11 at the transfer rate corresponding to the rotation speed, and at the same time, the output rate (corresponding to the lower limit value R min of the transfer rate is set based on the processing capacity of the host computer). .)
Is read by. Then, the read information is output to the host computer via the interface unit 14.

In step S4, if it is not the reproducing operation (step S4; NO), it is judged whether or not it is the seek operation (step S6), a predetermined seek operation is performed (step S7), and the seek operation is not performed. In that case (step S6; NO), a termination process such as fixing the optical pickup 3 is executed (step S24).

Next, when the reproducing operation in step S5 or the seek operation in step S7 is started, the position of the optical pickup, that is, the information reading position is detected by the optical pickup position sensor 5 (step S).
8).

Then, the detected reading position is zone 1
It is determined whether or not it is within (step S9). If it is in zone 1 (step S9; YES), R for buffer
In order to determine whether the AM 11 can be used, it is determined whether or not data in different zones remains (step S
10) If the data of the different zone does not remain (step S10; NO), the process proceeds to step S12, and if the data of the different zone remains (step S10; YES), the buffer RAM 11 In order to enable the use of the data, all the remaining data are read (step S11). Then, the rotation speed of the spindle motor 6 is set to the rotation speed corresponding to the zone 1 set in step S3 (step S12), the rotation speed is maintained (step S13), and the CLV disk 1 is driven by the rotation speed. Then, in order to reproduce the information (CAV reproduction), the process returns to step S4.

If it is not in zone 1 in step S9 (step S9; NO), it is determined whether or not it is in zone 2 (step S14). When it is determined that the zone is within the zone 2 (step S14; YES), the same process as the process for the zone 1 described above is executed (steps S15 to S18).

If it is not in zone 2 in step S14 (step S14; NO), it is determined whether or not it is in zone 3 (step S19). If it is determined that the zone is within the zone 3 (step S19; YES), the same process as the process for the zone 1 or 2 described above is executed (steps S20 to S23). Step S
If it is determined in 19 that the zone is not zone 3 (step S19; NO), it is determined that there is no information to be reproduced (the lead-out area), and an ending process such as fixing the optical pickup 3 is executed (step S19). S24).

Here, the specific operation in step S3 will be described with reference to FIG. In step S3, first, based on the radius of the innermost periphery of the program area on the CLV disk 1 and the lower limit value R min of the transfer rate, a virtual zone including the innermost periphery of the program area (in the first embodiment, CL in zone 1)
The rotation speed of the V disk 1 is determined. This lower limit value R min
Is usually the maximum value of the processing capacity of the transferred data of the host computer (hereinafter referred to as the processing capacity of the host computer).

More specifically, if the radius of the innermost periphery of the program area on the CLV disk 1 is r and the linear velocity of rotation of the CLV disk 1 corresponding to the lower limit value R min of the transfer rate is v, then v = The rotational angular velocity ω is obtained from r × ω (1), and from this, the rotational speed RM
Is required.

For example, R min = 700 kBytes / sec, r =
If it is 25 mm, RM = 1870 rpm.

When the rotational speed RM is determined, the rate of change of the transfer rate at that rotational speed (the slope of the line segment ac in FIG. 3)
Is required uniquely. That is, during reproduction of the zone 1 of the CLV disc 1, the transfer rate changes from its lower limit value R min according to the line segment ac in FIG. 3, and information is accumulated in the buffer RAM 11 according to this transfer rate. At the same time, the RA for buffer is output at the output rate (R min ) corresponding to the maximum processing capacity of the host computer.
It will be output from M11. When the rotation speed RM is determined and the rate of change of the transfer rate is determined, next, when the transfer rate changes at the rate of change, the point c that is the preset upper limit value R max of the transfer rate is obtained. The upper limit value R max is, for example, the maximum value of the processing capability of reading information into the buffer RAM 11 inside the CD player S, and is usually higher than the maximum processing capability of the host computer. However, the value of the upper limit value R max is not limited to this, and may be any value as long as it is equal to or less than the maximum value of the processing capacity for reading information into the buffer RAM 11.

When the point c is obtained, the point b on the reproduction time axis (horizontal axis) corresponding to this point c is determined to determine a ring shape as a radial range on the CLV disk 1 corresponding to the reproduction time Ob. Is defined as a virtual zone (zone 1). That is, the information amount M corresponding to the zone 1 corresponds to the area of the trapezoid aObc shown by the diagonal lines in FIG. 3, and this information amount M is constant in each virtual zone in this embodiment.

Here, the information amount to be stored in the buffer RAM 11 is the information amount A indicated by the area of the triangle acf in FIG. This information amount A is the buffer RA
If it is smaller than the storage capacity of M11 (confirmed in step S1), the above-mentioned method of determining the range of the virtual zone may be used, but if the information amount A is larger than the storage capacity of the buffer RAM 11, the buffer RAM 11 concerned. By determining a point e on the reproduction time axis (horizontal axis) corresponding to the storage capacity (corresponding to the area of the triangle agd in FIG. 3) as the radial range on the CLV disk 1 corresponding to the reproduction time Oe. The ring-shaped range of is a virtual zone.

When the information amount M corresponding to the innermost virtual zone (zone 1) of the program area of the CLV disk 1 is determined as described above, the similar information amount M is then determined.
Are included in the other virtual zones, their radius ranges are determined, and the radial position on the CLV disk 1 corresponding to the innermost circumference of each radius range and the lower limit value R of the transfer rate are included.
The number of revolutions in each virtual zone is determined by min in the same manner as described above (see equation (1)). The rotation speed of the other virtual zone does not become higher than the rotation speed of the innermost virtual zone (zone 1) of the CLV disk 1. Within the range of the other virtual zone, the transfer rate is the upper limit value. It does not exceed R max .

When the range of each virtual zone and the amount of information M contained therein are determined, these and the total amount of information stored in the CLV disc 1 confirmed in step S2 are used to reproduce the CLV disc 1. The number of virtual zones required is determined.

With the above operation, in step S3, the range of virtual zones required for reproduction of the CLV disc 1, the rotation speed of the CLV disc 1 for each virtual zone, and the number of virtual zones are determined.

FIG. 4 shows the information reproduction of the first embodiment.
In this case, the relationship between the reproduction time and the transfer rate is shown. Figure
According to the information reproduction of the first embodiment, as shown in FIG.
The trapezoids aObc in are arranged in parallel for the number of zones.
Therefore, the CLV disk 1 as a whole has the
Average transfer rate (Fig. 4R2), The average transfer rate of the present invention is
(Figure 4R 1) Is improved.

Further, the transfer rate itself is always a value equal to or higher than the output rate (R min ) set based on the processing capacity of the host computer. In addition, in more detail, when switching each virtual zone, the buffer R
A time is required to read all the information stored in the AM 11 (time to execute steps S11, S16 and S21 in FIG. 2), but it is a very short time.
Are omitted in.

According to the first embodiment described above, the information transfer rate can always be set to a value equal to or higher than the output rate (R min ) set on the basis of the processing capacity of the host computer. As a result, the average transfer rate is improved, the processing capability of the CD player S can be maximized, and the processing efficiency is improved. (III) Second Embodiment Next, a second embodiment corresponding to the invention described in claim 3 or 7 will be described with reference to FIG.

As is clear from the related description of the first embodiment, the range of the virtual zone and the number of revolutions in each virtual zone of the first embodiment are the storage capacity of the buffer RAM 11, the transfer rate R min and the CLV disk. Once the radius r of the innermost circumference of the 1st program area is determined, it is constant regardless of the total amount of information recorded on the CLV disc 1.
Further, the radius r of the innermost circumference of the program area of the CLV disk 1 is constant (25 mm) in all the disks.
It is standardized that Based on this,
In the second embodiment, the memory capacity of the buffer RAM 11, the transfer rate R min, and the radius of the innermost circumference of the program area are fixed, and the range of virtual zones and the number of rotations in each virtual zone are set in advance as a memory. The information is stored in the ROM 15, and only the number of virtual zones is determined according to the total amount of information of the CLV disc to be reproduced, and the information reproduction of the first embodiment is executed.

Next, the operation of the second embodiment will be described with reference to FIG. In FIG. 5, first, by reading the TOC information of the CLV disc 1, the CLV disc 1 is read.
The total amount of information stored in the disc 1 is confirmed (step S30).

Next, the preset range of the virtual zone and the number of revolutions in each virtual zone are read out from the ROM 15 (step S31), and this and the information stored in the CLV disk 1 confirmed in step S30. Based on the total amount, the number of virtual zones required to reproduce the CLV disc 1 is set (step S3).
2).

After that, the same processing as that of the first embodiment is performed (steps S4 to S24), and the detailed description is omitted. According to the second embodiment described above, in addition to the effect of the first embodiment, the radius range on the CLV disk 1 corresponding to the virtual zone and the rotation speed of the CLV disk 1 are stored in the ROM.
Since it is recorded in 15, the whole device can be simplified. (IV) Third Embodiment Next, a third embodiment corresponding to the invention described in claim 4 or 8 will be described with reference to FIG.

In the above-described first and second embodiments, the radius range of the virtual zone and the number of rotations of the recording medium for each virtual zone are determined in advance, and CAV reproduction is performed based on this. On the other hand, in the third embodiment shown in FIG. 6, the amount of information accumulated in the buffer RAM 11 and the transfer rate are monitored during the CAV reproduction without setting a virtual zone in advance, and the buffer RAM 11 is monitored.
The amount of information accumulated in a predetermined amount (80 in FIG. 6)
%) Or the transfer rate exceeds its upper limit (R max in FIG. 3 or FIG. 4), the CLV at that time is reached.
The rotation speed is newly set based on the information reading position on the disk 1 and the lower limit of the transfer rate (R min in FIG. 3 or FIG. 4).

Here, the upper limit value R max can be set to an arbitrary value as long as it is equal to or less than the maximum value of the processing capacity for reading information into the buffer RAM 11. In the third embodiment shown in FIG. 6, first, a buffer RAM
The recording capacity usable as the buffer of 11 is confirmed (step S40).

Then, it is judged whether or not the reproduction is started (step S41), and if the reproduction is started (step S41; YE).
S), the rotational speed RM of the CLV disk is set (step S42).

In the processing in step S42,
Based on the radius of the CLV disc 1 at the information reading position where reproduction is started and the lower limit value R min of the transfer rate preset by an instruction from the outside, a method similar to that of the first embodiment (equation of the first embodiment (equation ( The rotational speed RM is determined according to 1) and its related description).

Here, in FIG. 6, the innermost position of the program area of the CLV disc 1 (radius 25 m of the CLV disc 1 is set as the information reading position for starting reproduction.
Although fixed as m), when the reproduction is started from a position other than the innermost circumference of the CLV disc 1, a step of detecting the information reading position based on the position of the optical pickup 3 is required.

If the lower limit value R min of the transfer rate is not made variable and the reproduction is started from the innermost circumference of the program area, the rotation speed is constant regardless of the disc, so that the rotation speed is stored in the ROM 15 Stored in step S42.
You may make it read in.

In step S41, if it is not a reproducing operation (step S41; NO), it is judged whether or not it is a seek operation (step S47), and if it is a seek operation (step S47; YES), a predetermined seek operation is performed. The operation is performed (step S48), and when it is not the seek operation (step S47; NO), the ending process such as fixing the optical pickup 3 is executed (step S51).

When the rotational speed RM is set (step S4)
2) The reproduction operation is started (step S43). In the reproducing operation, the CLV disk 1 is driven at the constant rotation speed set in step S42, and information is transferred to the buffer RAM 1 at the transfer rate corresponding to the rotation speed.
1, and at the same time, is read at an output rate (corresponding to the lower limit value R min of the transfer rate) set based on the processing capacity of the host computer. Then, the read information is output to the host computer via the interface unit 14.

Next, in step S44, the amount of information stored in the buffer RAM 11 is detected based on the usable recording capacity confirmed in step S40. Then, it is determined whether or not the information amount is 80% or more of the usable recording capacity (step S45). 80%
If it is less than (step S45; NO), then it is determined whether or not the transfer rate at that time exceeds the upper limit R max (step S46). Maximum transfer rate R
If it does not exceed max (step S46; N
O), the process returns to step S43 to continue the reproduction.

Although the predetermined amount is set to 80% in step S45, the present invention is not limited to this.
For example, it can be set to an appropriate value such as 100% as the amount of information stored in the buffer RAM 11 when switching the rotation speed.

When the amount of information stored in the buffer RAM 11 is 80% or more of the usable recording capacity (step S45; YES), or when the transfer rate at that time exceeds the upper limit Rmax. (Step S46; Y
ES), and then, in step S49, to re-set the rotation speed of the CLV disc 1, the optical pickup 3
Position, that is, the information reading position is detected by the optical pickup position sensor 5. Then, it is judged whether or not the detected position is the end position (the position within the lead-out area of the CLV disc 1) (step S50), and if it is the end position (step S5).
(0; YES), the process is terminated as the reproduction is finished, and when it is not the end position (step S50; NO), the position is set as the reproduction start point at the next rotation speed and corresponds to the information reading position at that time. Based on the radius of the CLV disk 1 and the lower limit value R min of the transfer rate, the first or second
A rotation speed (this rotation speed is lower than the rotation speed RM up to then) is newly set by the same method as in the embodiment (see the formula (1) of the first embodiment and its related description) (step S5).
2) The rotation speed of the spindle motor 6 is set to a new rotation speed (step S53), and while the rotation speed is maintained (step S54), all the information in the buffer RAM 11 is read (step S55). ), Step S
Returning to step 43, the information is reproduced (CAV reproduction) by the new rotation speed.

The relationship between the reproduction time and the transfer rate when the information is reproduced by the operation of the third embodiment described above shows the same change as that shown in FIG. Here, in FIG. 4, at the point (time) at which the transfer rate becomes discontinuous, the information read position at that time is set as a new correction start position, and a new rotation speed is reset.

According to the third embodiment described above, since the information transfer rate can be always set to a value equal to or higher than the output rate set based on the processing capacity of the host computer, the CLV disk 1 as a whole is averaged. The transfer rate is improved, the processing capability of the CD player S can be maximized, and the processing efficiency is improved.

[0089]

As described above, according to the first, second, and fifth aspects.
According to the invention described in (6), when the information recorded on the recording medium corresponding to the range of one virtual zone is reproduced, the lower limit value of the transfer rate equal to or higher than a preset predetermined output rate and Since the recording medium is driven at a constant rotation speed based on the radius on the recording medium corresponding to the innermost circumference of the one virtual zone and information is reproduced, the transfer rate is always set to a value equal to or higher than a predetermined output rate. Therefore, the average transfer rate of the recording medium as a whole is improved.

Therefore, the processing capacity of the information reproducing apparatus of the present invention can be maximized and the processing efficiency is improved. Furthermore, if the lower limit value of the transfer rate is set to the upper limit value of the processing speed of an external device other than the information reproducing device of the present invention, the processing capacity of the external device can be maximized and the processing efficiency is further improved.

According to the invention described in claim 3 or 7, in addition to the effect of the invention described in claim 1, 2, 5 or 6, the radius range on the recording medium corresponding to the virtual zone and the recording medium Since the number of rotations is recorded in the memory, the entire device can be simplified.

According to the invention of claim 4 or 8, the rotation set based on the lower limit value of the transfer rate equal to or higher than the predetermined output rate and the radial position of the recording medium corresponding to the reproduction start position on the recording medium. Depending on the number, the recording medium is rotated and information is reproduced, and when the amount of information recorded in the buffer memory exceeds a predetermined amount or the transfer rate exceeds its upper limit, it corresponds to the information read position at that time. Since the radial position on the recording medium is set as a new reproduction start position, the transfer rate can always be a value equal to or higher than a predetermined output rate, and the average transfer rate of the entire recording medium is improved.

Therefore, the processing capacity of the information reproducing apparatus of the present invention can be maximized and the processing efficiency is improved. Furthermore, if the lower limit value of the transfer rate is set to the upper limit value of the processing speed of an external processing device other than the information reproducing device of the present invention,
The processing capacity of the external processing device can be maximized, and the processing efficiency is further improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a CD-ROM player according to an embodiment.

FIG. 2 is a flowchart showing the operation of the first embodiment.

FIG. 3 is a diagram illustrating setting of a virtual zone.

FIG. 4 is a diagram showing a difference between a change in transfer rate in information reproduction of a conventional technique and a change in transfer rate in information reproduction of the present invention.

FIG. 5 is a flowchart showing the operation of the second embodiment.

FIG. 6 is a flowchart showing the operation of the third embodiment.

[Explanation of symbols]

1 ... CLV disc 2 ... Pickup part 3 ... Optical pickup 4 ... buffer 5 ... Optical pickup position sensor 6 ... Spindle motor 7 ... Carriage motor 8 ... Signal processing unit 9 ... RF amplifier 10 ... Servo signal processor 11 ... RAM for buffer 12 ... Digital signal processing unit 13 ... Controller 14 ... Interface part 15 ... ROM S ... CD-ROM player M: Total amount of information in one virtual zone

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Ishii 4-2610 Hanazono, Tokorozawa-shi, Saitama Pioneer Co., Ltd. Tokorozawa factory (72) Inventor Shinichi Kabara 4-2610 Hanazono, Saitama Prefecture Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Yoshifumi Tsukada 42610 Hanazono, Tokorozawa City, Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Kanaya Matsumoto 1-4-1 Meguro, Meguro-ku, Tokyo Pioneer Co., Ltd. In-house (56) Reference JP-A-6-162670 (JP, A) JP-A-6-150534 (JP, A) JP-A-7-262692 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) G11B 20/10 G11B 19/00-19/28

Claims (8)

(57) [Claims]
1. An information reproducing method of reproducing the information of a disk-shaped recording medium on which information is recorded at a constant linear velocity through a buffer memory and outputting the information to an external device at a predetermined output rate, the disk-shaped recording medium. The upper limit value and the lower limit value of the transfer rate preset so that the transfer rate when the information reproduced from the above is read into the buffer memory is equal to or higher than the predetermined output rate, and the information on the recording medium is recorded. Based on the radius of the innermost circumference of the range and the storage capacity of the buffer memory, the radius range on the recording medium corresponding to the plurality of ring-shaped virtual zones for reproducing the information and the recording for each virtual zone A setting step of setting the number of rotations of the medium, and information for reproducing the information while maintaining the number of rotations corresponding to the virtual zone in the virtual zone. Information reproducing method comprising: a raw process.
2. An information reproducing method for reproducing the information on a disk-shaped recording medium on which information is recorded at a constant linear velocity via a buffer memory and outputting the information to an external device at a predetermined output rate. The upper limit value and the lower limit value of the transfer rate preset so that the transfer rate when the information reproduced from the above is read into the buffer memory is equal to or higher than the predetermined output rate, and the information on the recording medium is recorded. Based on the radius of the innermost circumference of the range and the storage capacity of the buffer memory, the radius range on the recording medium corresponding to the plurality of ring-shaped virtual zones for reproducing the information and the recording for each virtual zone A setting step of setting the number of rotations of the medium, a detecting step of detecting a read position of the information on the recording medium, and a reading of the detected information A discriminating step of discriminating the virtual zone including the read position based on the position; an information reproducing step of reproducing the information while maintaining the rotation speed corresponding to the virtual zone in the discriminated virtual zone, An information reproducing method comprising:
3. An upper limit of the transfer rate preset so that the transfer rate when reading the information reproduced from the disc-shaped recording medium in which the information is recorded at a constant linear velocity is equal to or higher than a predetermined output rate. A plurality of ring-shaped virtual zones for reproducing the information are preset based on the value and the lower limit value, the radius of the innermost circumference of the range in which the information is recorded on the recording medium, and the storage capacity of the buffer memory. Then, the radius range on the recording medium corresponding to the virtual zone and the rotation speed of the recording medium for each virtual zone are stored in a memory in advance, and the information of the disk-shaped recording medium is stored based on the content of the memory. Is reproduced through the buffer memory, and is output to an external device at the predetermined output rate, wherein A reading step of reading the number of rotations, a detecting step of detecting a reading position of the information on the recording medium, and a judging step of judging the virtual zone including the reading position based on the detected reading position of the information. And an information reproducing step of reproducing the information in the determined virtual zone while maintaining the rotation speed corresponding to the virtual zone.
4. An information reproducing method for reproducing the information of a disk-shaped recording medium on which information is recorded at a constant linear velocity through a buffer memory and outputting the information to an external device at a predetermined output rate, wherein the disk-shaped recording medium. The recording medium corresponding to the lower limit value of the transfer rate and the reproduction start position on the recording medium, which are preset so that the transfer rate when the information reproduced from the buffer memory is read into the buffer memory is equal to or higher than the predetermined output rate. A rotation speed setting step of setting the rotation speed of the recording medium based on the radial position of the recording medium, an information reproduction step of reproducing the information while maintaining the rotation speed set in the rotation speed setting step, and the buffer memory. A detection step of detecting the amount of accumulated information, and a preset transfer rate at the time of reading the information into the buffer memory. A determination step of determining whether or not the transfer rate exceeds a limit value; and, when the information amount is equal to or more than a predetermined amount or the transfer rate exceeds the upper limit value, accumulated in the buffer memory. When all the information is read, the read position of the information on the recording medium when the information amount is equal to or more than a predetermined amount or the transfer rate exceeds the upper limit is set as the reproduction start position. An information reproducing method comprising: a setting step.
5. An information reproducing apparatus for reproducing the information of a disk recording medium on which information is recorded at a constant linear velocity through a buffer memory and outputting the information to an external device at a predetermined output rate, wherein the disk recording medium. The upper limit value and the lower limit value of the transfer rate preset so that the transfer rate when the information reproduced from the above is read into the buffer memory is equal to or higher than the predetermined output rate, and the information on the recording medium is recorded. Based on the radius of the innermost circumference of the range and the storage capacity of the buffer memory, the radius range on the recording medium corresponding to the plurality of ring-shaped virtual zones for reproducing the information and the recording for each virtual zone Setting means for setting the number of rotations of the medium, and information for reproducing the information while maintaining the number of rotations corresponding to the virtual zone in the virtual zone Information reproducing apparatus characterized by comprising a raw device.
6. An information reproducing apparatus which reproduces the information of a disk-shaped recording medium on which information is recorded at a constant linear velocity through a buffer memory and outputs the information to an external device at a predetermined output rate, wherein the disk-shaped recording medium. The upper limit value and the lower limit value of the transfer rate preset so that the transfer rate when the information reproduced from the above is read into the buffer memory is equal to or higher than the predetermined output rate, and the information on the recording medium is recorded. Based on the radius of the innermost circumference of the range and the storage capacity of the buffer memory, the radius range on the recording medium corresponding to the plurality of ring-shaped virtual zones for reproducing the information and the recording for each virtual zone Setting means for setting the number of rotations of the medium, detecting means for detecting a read position of the information on the recording medium, and reading of the detected information A discriminating means for discriminating the virtual zone including the read position based on the position; and an information reproducing means for reproducing the information while maintaining the rotation speed corresponding to the virtual zone in the discriminated virtual zone, An information reproducing apparatus comprising:
7. An upper limit of the transfer rate preset so that the transfer rate when reading the information reproduced from a disk-shaped recording medium in which information is recorded at a constant linear velocity into a buffer memory is equal to or higher than a predetermined output rate. A plurality of ring-shaped virtual zones for reproducing the information are preset based on the value and the lower limit value, the radius of the innermost circumference of the range in which the information is recorded on the recording medium, and the storage capacity of the buffer memory. However, it has a memory in which the radius range on the recording medium corresponding to the virtual zone and the number of rotations of the recording medium for each virtual zone are stored in advance, and the information is stored in the buffer memory based on the contents of the memory. An information reproducing device which reproduces the data through an external device and outputs it to an external device at the predetermined output rate, wherein the radius range and the rotation speed are read from the memory. A protruding means, a detecting means for detecting a read position of the information on the recording medium, a judging means for judging the virtual zone including the read position based on the detected read position of the information, An information reproducing device for reproducing the information while maintaining the rotation speed corresponding to the virtual zone in the virtual zone.
8. An information reproducing apparatus for reproducing the information of a disk-shaped recording medium on which information is recorded at a constant linear velocity through a buffer memory and outputting the information to an external device at a predetermined output rate, wherein the disk-shaped recording medium. The recording medium corresponding to the lower limit value of the transfer rate and the reproduction start position on the recording medium, which are preset so that the transfer rate when the information reproduced from the buffer memory is read into the buffer memory is equal to or higher than the predetermined output rate. A rotation speed setting means for setting the rotation speed of the recording medium based on the radius position of the recording medium; an information reproducing means for reproducing the information while maintaining the rotation speed set in the rotation speed setting step; Detecting means for detecting the amount of accumulated information, and a preset transfer rate at the time of reading the information into the buffer memory. Determination means for determining whether or not the transfer rate exceeds a limit value; and, when the information amount becomes a predetermined amount or more, or when the transfer rate exceeds the upper limit value, accumulated in the buffer memory. When all the information is read, the read position of the information on the recording medium when the information amount is equal to or more than a predetermined amount or the transfer rate exceeds the upper limit is set as the reproduction start position. An information reproducing apparatus comprising: a setting unit.
JP24987494A 1994-10-14 1994-10-14 Information reproducing method and apparatus Expired - Fee Related JP3380626B2 (en)

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JP24987494A JP3380626B2 (en) 1994-10-14 1994-10-14 Information reproducing method and apparatus
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US5808990A (en) * 1996-12-17 1998-09-15 Cinram, Inc. Method and apparatus for controlling the linear velocity between an optical head and a rotation disk
US6246650B1 (en) * 1996-12-18 2001-06-12 Sony Corporation Method and apparatus for high speed data reproduction
JP3619673B2 (en) * 1997-07-02 2005-02-09 三星電子株式会社 Method for determining the double speed of an optical disk player according to the optical disk status
US6044047A (en) * 1997-10-21 2000-03-28 Sony Corporation Storing CD Segments for quick scanning in multi-CD players
GB2381371B (en) * 1998-10-21 2003-06-11 Martin John Baker Digital audio/video playback arrangement
CN1213426C (en) 1999-08-31 2005-08-03 松下电器产业株式会社 Disk reproducing system
JP3989665B2 (en) 2000-03-03 2007-10-10 株式会社リコー Optical information recording medium
JP3831189B2 (en) * 2000-09-29 2006-10-11 富士通株式会社 Rotation control method and storage device
JP4435822B2 (en) 2007-10-31 2010-03-24 株式会社東芝 Information processing apparatus and read control method

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